/* $Id$ */ /** @file newgrf_station.cpp Functions for dealing with station classes and custom stations. */ #include "stdafx.h" #include "openttd.h" #include "variables.h" #include "functions.h" #include "landscape.h" #include "debug.h" #include "sprite.h" #include "table/sprites.h" #include "table/strings.h" #include "station.h" #include "station_map.h" #include "newgrf.h" #include "newgrf_callbacks.h" #include "newgrf_commons.h" #include "newgrf_station.h" #include "newgrf_spritegroup.h" #include "date.h" #include "helpers.hpp" #include "cargotype.h" #include "town_map.h" #include "newgrf_town.h" static StationClass station_classes[STAT_CLASS_MAX]; enum { MAX_SPECLIST = 255, }; /** * Reset station classes to their default state. * This includes initialising the Default and Waypoint classes with an empty * entry, for standard stations and waypoints. */ void ResetStationClasses() { for (StationClassID i = STAT_CLASS_BEGIN; i < STAT_CLASS_MAX; i++) { station_classes[i].id = 0; station_classes[i].name = STR_EMPTY; station_classes[i].stations = 0; free(station_classes[i].spec); station_classes[i].spec = NULL; } /* Set up initial data */ station_classes[0].id = 'DFLT'; station_classes[0].name = STR_STAT_CLASS_DFLT; station_classes[0].stations = 1; station_classes[0].spec = MallocT<StationSpec*>(1); station_classes[0].spec[0] = NULL; station_classes[1].id = 'WAYP'; station_classes[1].name = STR_STAT_CLASS_WAYP; station_classes[1].stations = 1; station_classes[1].spec = MallocT<StationSpec*>(1); station_classes[1].spec[0] = NULL; } /** * Allocate a station class for the given class id. * @param cls A 32 bit value identifying the class. * @return Index into station_classes of allocated class. */ StationClassID AllocateStationClass(uint32 cls) { for (StationClassID i = STAT_CLASS_BEGIN; i < STAT_CLASS_MAX; i++) { if (station_classes[i].id == cls) { /* ClassID is already allocated, so reuse it. */ return i; } else if (station_classes[i].id == 0) { /* This class is empty, so allocate it to the ClassID. */ station_classes[i].id = cls; return i; } } grfmsg(2, "StationClassAllocate: already allocated %d classes, using default", STAT_CLASS_MAX); return STAT_CLASS_DFLT; } /** Set the name of a custom station class */ void SetStationClassName(StationClassID sclass, StringID name) { assert(sclass < STAT_CLASS_MAX); station_classes[sclass].name = name; } /** Retrieve the name of a custom station class */ StringID GetStationClassName(StationClassID sclass) { assert(sclass < STAT_CLASS_MAX); return station_classes[sclass].name; } /** Build a list of station class name StringIDs to use in a dropdown list * @return Pointer to a (static) array of StringIDs */ StringID *BuildStationClassDropdown() { /* Allow room for all station classes, plus a terminator entry */ static StringID names[STAT_CLASS_MAX + 1]; uint i; /* Add each name */ for (i = 0; i < STAT_CLASS_MAX && station_classes[i].id != 0; i++) { names[i] = station_classes[i].name; } /* Terminate the list */ names[i] = INVALID_STRING_ID; return names; } /** * Get the number of station classes in use. * @return Number of station classes. */ uint GetNumStationClasses() { uint i; for (i = 0; i < STAT_CLASS_MAX && station_classes[i].id != 0; i++); return i; } /** * Return the number of stations for the given station class. * @param sclass Index of the station class. * @return Number of stations in the class. */ uint GetNumCustomStations(StationClassID sclass) { assert(sclass < STAT_CLASS_MAX); return station_classes[sclass].stations; } /** * Tie a station spec to its station class. * @param statspec The station spec. */ void SetCustomStationSpec(StationSpec *statspec) { StationClass *station_class; int i; /* If the station has already been allocated, don't reallocate it. */ if (statspec->allocated) return; assert(statspec->sclass < STAT_CLASS_MAX); station_class = &station_classes[statspec->sclass]; i = station_class->stations++; station_class->spec = ReallocT(station_class->spec, station_class->stations); station_class->spec[i] = statspec; statspec->allocated = true; } /** * Retrieve a station spec from a class. * @param sclass Index of the station class. * @param station The station index with the class. * @return The station spec. */ const StationSpec *GetCustomStationSpec(StationClassID sclass, uint station) { assert(sclass < STAT_CLASS_MAX); if (station < station_classes[sclass].stations) return station_classes[sclass].spec[station]; /* If the custom station isn't defined any more, then the GRF file * probably was not loaded. */ return NULL; } const StationSpec *GetCustomStationSpecByGrf(uint32 grfid, byte localidx) { uint j; for (StationClassID i = STAT_CLASS_BEGIN; i < STAT_CLASS_MAX; i++) { for (j = 0; j < station_classes[i].stations; j++) { const StationSpec *statspec = station_classes[i].spec[j]; if (statspec == NULL) continue; if (statspec->grffile->grfid == grfid && statspec->localidx == localidx) return statspec; } } return NULL; } /* Evaluate a tile's position within a station, and return the result a bitstuffed format. * if not centred: .TNLcCpP, if centred: .TNL..CP * T = Tile layout number (GetStationGfx), N = Number of platforms, L = Length of platforms * C = Current platform number from start, c = from end * P = Position along platform from start, p = from end * if centred, C/P start from the centre and c/p are not available. */ uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, int y, bool centred) { uint32 retval = 0; if (axis == AXIS_X) { Swap(platforms, length); Swap(x, y); } /* Limit our sizes to 4 bits */ platforms = min(15, platforms); length = min(15, length); x = min(15, x); y = min(15, y); if (centred) { x -= platforms / 2; y -= length / 2; SB(retval, 0, 4, y & 0xF); SB(retval, 4, 4, x & 0xF); } else { SB(retval, 0, 4, y); SB(retval, 4, 4, length - y - 1); SB(retval, 8, 4, x); SB(retval, 12, 4, platforms - x - 1); } SB(retval, 16, 4, length); SB(retval, 20, 4, platforms); SB(retval, 24, 4, tile); return retval; } /* Find the end of a railway station, from the tile, in the direction of delta. * If check_type is set, we stop if the custom station type changes. * If check_axis is set, we stop if the station direction changes. */ static TileIndex FindRailStationEnd(TileIndex tile, TileIndexDiff delta, bool check_type, bool check_axis) { bool waypoint; byte orig_type = 0; Axis orig_axis = AXIS_X; waypoint = IsTileType(tile, MP_RAILWAY); if (waypoint) { if (check_axis) orig_axis = GetWaypointAxis(tile); } else { if (check_type) orig_type = GetCustomStationSpecIndex(tile); if (check_axis) orig_axis = GetRailStationAxis(tile); } while (true) { TileIndex new_tile = TILE_ADD(tile, delta); if (waypoint) { if (!IsTileType(new_tile, MP_RAILWAY)) break; if (!IsRailWaypoint(new_tile)) break; if (check_axis && GetWaypointAxis(new_tile) != orig_axis) break; } else { if (!IsRailwayStationTile(new_tile)) break; if (check_type && GetCustomStationSpecIndex(new_tile) != orig_type) break; if (check_axis && GetRailStationAxis(new_tile) != orig_axis) break; } tile = new_tile; } return tile; } static uint32 GetPlatformInfoHelper(TileIndex tile, bool check_type, bool check_axis, bool centred) { int tx = TileX(tile); int ty = TileY(tile); int sx = TileX(FindRailStationEnd(tile, TileDiffXY(-1, 0), check_type, check_axis)); int sy = TileY(FindRailStationEnd(tile, TileDiffXY( 0, -1), check_type, check_axis)); int ex = TileX(FindRailStationEnd(tile, TileDiffXY( 1, 0), check_type, check_axis)) + 1; int ey = TileY(FindRailStationEnd(tile, TileDiffXY( 0, 1), check_type, check_axis)) + 1; Axis axis = IsTileType(tile, MP_RAILWAY) ? GetWaypointAxis(tile) : GetRailStationAxis(tile); tx -= sx; ex -= sx; ty -= sy; ey -= sy; return GetPlatformInfo(axis, IsTileType(tile, MP_RAILWAY) ? 2 : GetStationGfx(tile), ex, ey, tx, ty, centred); } static uint32 GetRailContinuationInfo(TileIndex tile) { /* Tile offsets and exit dirs for X axis */ static const Direction x_dir[8] = { DIR_SW, DIR_NE, DIR_SE, DIR_NW, DIR_S, DIR_E, DIR_W, DIR_N }; static const DiagDirection x_exits[8] = { DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SW, DIAGDIR_NE }; /* Tile offsets and exit dirs for Y axis */ static const Direction y_dir[8] = { DIR_SE, DIR_NW, DIR_SW, DIR_NE, DIR_S, DIR_W, DIR_E, DIR_N }; static const DiagDirection y_exits[8] = { DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SE, DIAGDIR_NW }; Axis axis = IsTileType(tile, MP_RAILWAY) ? GetWaypointAxis(tile) : GetRailStationAxis(tile); /* Choose appropriate lookup table to use */ const Direction *dir = axis == AXIS_X ? x_dir : y_dir; const DiagDirection *diagdir = axis == AXIS_X ? x_exits : y_exits; uint32 res = 0; uint i; for (i = 0; i < lengthof(x_dir); i++, dir++, diagdir++) { uint32 ts = GetTileTrackStatus(tile + TileOffsByDir(*dir), TRANSPORT_RAIL, 0); if (ts != 0) { /* If there is any track on the tile, set the bit in the second byte */ SetBit(res, i + 8); /* If any track reaches our exit direction, set the bit in the lower byte */ if (ts & DiagdirReachesTracks(*diagdir)) SetBit(res, i); } } return res; } /* Station Resolver Functions */ static uint32 StationGetRandomBits(const ResolverObject *object) { const Station *st = object->u.station.st; const TileIndex tile = object->u.station.tile; return (st == NULL ? 0 : st->random_bits) | (tile == INVALID_TILE ? 0 : GetStationTileRandomBits(tile) << 16); } static uint32 StationGetTriggers(const ResolverObject *object) { const Station *st = object->u.station.st; return st == NULL ? 0 : st->waiting_triggers; } static void StationSetTriggers(const ResolverObject *object, int triggers) { Station *st = (Station*)object->u.station.st; assert(st != NULL); st->waiting_triggers = triggers; } /** * Station variable cache * This caches 'expensive' station variable lookups which iterate over * several tiles that may be called multiple times per Resolve(). */ static struct { uint32 v40; uint32 v41; uint32 v45; uint32 v46; uint32 v47; uint32 v49; uint8 valid; } _svc; static uint32 StationGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available) { const Station *st = object->u.station.st; TileIndex tile = object->u.station.tile; if (object->scope == VSG_SCOPE_PARENT) { /* Pass the request on to the town of the station */ Town *t; if (st != NULL) { t = st->town; } else if (tile != INVALID_TILE) { t = GetTownByTile(tile); } else { *available = false; return UINT_MAX; } return TownGetVariable(variable, parameter, available, t); } if (st == NULL) { /* Station does not exist, so we're in a purchase list */ switch (variable) { case 0x40: case 0x41: case 0x46: case 0x47: case 0x49: return 0x2110000; // Platforms, tracks & position case 0x42: return 0; // Rail type (XXX Get current type from GUI?) case 0x43: return _current_player; // Station owner case 0x44: return 2; // PBS status case 0xFA: return Clamp(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535); // Build date, clamped to a 16 bit value } *available = false; return UINT_MAX; } switch (variable) { /* Calculated station variables */ case 0x40: if (!HasBit(_svc.valid, 0)) { _svc.v40 = GetPlatformInfoHelper(tile, false, false, false); SetBit(_svc.valid, 0); } return _svc.v40; case 0x41: if (!HasBit(_svc.valid, 1)) { _svc.v41 = GetPlatformInfoHelper(tile, true, false, false); SetBit(_svc.valid, 1); } return _svc.v41; case 0x42: return GetTerrainType(tile) | (GetRailType(tile) << 8); case 0x43: return st->owner; // Station owner case 0x44: return 2; // PBS status case 0x45: if (!HasBit(_svc.valid, 2)) { _svc.v45 = GetRailContinuationInfo(tile); SetBit(_svc.valid, 2); } return _svc.v45; case 0x46: if (!HasBit(_svc.valid, 3)) { _svc.v46 = GetPlatformInfoHelper(tile, false, false, true); SetBit(_svc.valid, 3); } return _svc.v46; case 0x47: if (!HasBit(_svc.valid, 4)) { _svc.v47 = GetPlatformInfoHelper(tile, true, false, true); SetBit(_svc.valid, 4); } return _svc.v47; case 0x48: { // Accepted cargo types CargoID cargo_type; uint32 value = 0; for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) { if (HasBit(st->goods[cargo_type].acceptance_pickup, GoodsEntry::PICKUP)) SetBit(value, cargo_type); } return value; } case 0x49: if (!HasBit(_svc.valid, 5)) { _svc.v49 = GetPlatformInfoHelper(tile, false, true, false); SetBit(_svc.valid, 5); } return _svc.v49; /* Variables which use the parameter */ /* Variables 0x60 to 0x65 are handled separately below */ /* General station properties */ case 0x82: return 50; case 0x84: return st->string_id; case 0x86: return 0; case 0x8A: return st->had_vehicle_of_type; case 0xF0: return st->facilities; case 0xF1: return st->airport_type; case 0xF2: return st->truck_stops->status; case 0xF3: return st->bus_stops->status; case 0xF6: return st->airport_flags; case 0xF7: return GB(st->airport_flags, 8, 8); case 0xFA: return Clamp(st->build_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0, 65535); } /* Handle cargo variables with parameter, 0x60 to 0x65 */ if (variable >= 0x60 && variable <= 0x65) { CargoID c = GetCargoTranslation(parameter, object->u.station.statspec->grffile); if (c == CT_INVALID) return 0; const GoodsEntry *ge = &st->goods[c]; switch (variable) { case 0x60: return min(ge->cargo.Count(), 4095); case 0x61: return ge->days_since_pickup; case 0x62: return ge->rating; case 0x63: return ge->cargo.DaysInTransit(); case 0x64: return ge->last_speed | (ge->last_age << 8); case 0x65: return GB(ge->acceptance_pickup, GoodsEntry::ACCEPTANCE, 1) << 3; } } /* Handle cargo variables (deprecated) */ if (variable >= 0x8C && variable <= 0xEC) { const GoodsEntry *g = &st->goods[GB(variable - 0x8C, 3, 4)]; switch (GB(variable - 0x8C, 0, 3)) { case 0: return g->cargo.Count(); case 1: return GB(min(g->cargo.Count(), 4095), 0, 4) | (GB(g->acceptance_pickup, GoodsEntry::ACCEPTANCE, 1) << 7); case 2: return g->days_since_pickup; case 3: return g->rating; case 4: return g->cargo.Source(); case 5: return g->cargo.DaysInTransit(); case 6: return g->last_speed; case 7: return g->last_age; } } DEBUG(grf, 1, "Unhandled station property 0x%X", variable); *available = false; return UINT_MAX; } static const SpriteGroup *StationResolveReal(const ResolverObject *object, const SpriteGroup *group) { const Station *st = object->u.station.st; const StationSpec *statspec = object->u.station.statspec; uint set; uint cargo = 0; CargoID cargo_type = object->u.station.cargo_type; if (st == NULL || statspec->sclass == STAT_CLASS_WAYP) { return group->g.real.loading[0]; } switch (cargo_type) { case CT_INVALID: case CT_DEFAULT_NA: case CT_PURCHASE: cargo = 0; break; case CT_DEFAULT: for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) { cargo += st->goods[cargo_type].cargo.Count(); } break; default: cargo = st->goods[cargo_type].cargo.Count(); break; } if (HasBit(statspec->flags, 1)) cargo /= (st->trainst_w + st->trainst_h); cargo = min(0xfff, cargo); if (cargo > statspec->cargo_threshold) { if (group->g.real.num_loading > 0) { set = ((cargo - statspec->cargo_threshold) * group->g.real.num_loading) / (4096 - statspec->cargo_threshold); return group->g.real.loading[set]; } } else { if (group->g.real.num_loaded > 0) { set = (cargo * group->g.real.num_loaded) / (statspec->cargo_threshold + 1); return group->g.real.loaded[set]; } } return group->g.real.loading[0]; } static void NewStationResolver(ResolverObject *res, const StationSpec *statspec, const Station *st, TileIndex tile) { res->GetRandomBits = StationGetRandomBits; res->GetTriggers = StationGetTriggers; res->SetTriggers = StationSetTriggers; res->GetVariable = StationGetVariable; res->ResolveReal = StationResolveReal; res->u.station.st = st; res->u.station.statspec = statspec; res->u.station.tile = tile; res->callback = CBID_NO_CALLBACK; res->callback_param1 = 0; res->callback_param2 = 0; res->last_value = 0; res->trigger = 0; res->reseed = 0; } static const SpriteGroup *ResolveStation(ResolverObject *object) { const SpriteGroup *group; CargoID ctype = CT_DEFAULT_NA; if (object->u.station.st == NULL) { /* No station, so we are in a purchase list */ ctype = CT_PURCHASE; } else { /* Pick the first cargo that we have waiting */ for (CargoID cargo = 0; cargo < NUM_CARGO; cargo++) { const CargoSpec *cs = GetCargo(cargo); if (cs->IsValid() && object->u.station.statspec->spritegroup[cargo] != NULL && !object->u.station.st->goods[cargo].cargo.Empty()) { ctype = cargo; break; } } } group = object->u.station.statspec->spritegroup[ctype]; if (group == NULL) { ctype = CT_DEFAULT; group = object->u.station.statspec->spritegroup[ctype]; } if (group == NULL) return NULL; /* Remember the cargo type we've picked */ object->u.station.cargo_type = ctype; /* Invalidate all cached vars */ _svc.valid = 0; return Resolve(group, object); } SpriteID GetCustomStationRelocation(const StationSpec *statspec, const Station *st, TileIndex tile) { const SpriteGroup *group; ResolverObject object; NewStationResolver(&object, statspec, st, tile); group = ResolveStation(&object); if (group == NULL || group->type != SGT_RESULT) return 0; return group->g.result.sprite - 0x42D; } SpriteID GetCustomStationGroundRelocation(const StationSpec *statspec, const Station *st, TileIndex tile) { const SpriteGroup *group; ResolverObject object; NewStationResolver(&object, statspec, st, tile); object.callback_param1 = 1; // Indicate we are resolving the ground sprite group = ResolveStation(&object); if (group == NULL || group->type != SGT_RESULT) return 0; return group->g.result.sprite - 0x42D; } uint16 GetStationCallback(CallbackID callback, uint32 param1, uint32 param2, const StationSpec *statspec, const Station *st, TileIndex tile) { const SpriteGroup *group; ResolverObject object; NewStationResolver(&object, statspec, st, tile); object.callback = callback; object.callback_param1 = param1; object.callback_param2 = param2; group = ResolveStation(&object); if (group == NULL || group->type != SGT_CALLBACK) return CALLBACK_FAILED; return group->g.callback.result; } /** * Allocate a StationSpec to a Station. This is called once per build operation. * @param statspec StationSpec to allocate. * @param st Station to allocate it to. * @param exec Whether to actually allocate the spec. * @return Index within the Station's spec list, or -1 if the allocation failed. */ int AllocateSpecToStation(const StationSpec *statspec, Station *st, bool exec) { uint i; if (statspec == NULL) return 0; /* Check if this spec has already been allocated */ for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) { if (st->speclist[i].spec == statspec) return i; } for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) { if (st->speclist[i].spec == NULL && st->speclist[i].grfid == 0) break; } if (i == MAX_SPECLIST) return -1; if (exec) { if (i >= st->num_specs) { st->num_specs = i + 1; st->speclist = ReallocT(st->speclist, st->num_specs); if (st->num_specs == 2) { /* Initial allocation */ st->speclist[0].spec = NULL; st->speclist[0].grfid = 0; st->speclist[0].localidx = 0; } } st->speclist[i].spec = statspec; st->speclist[i].grfid = statspec->grffile->grfid; st->speclist[i].localidx = statspec->localidx; } return i; } /** Deallocate a StationSpec from a Station. Called when removing a single station tile. * @param st Station to work with. * @param specindex Index of the custom station within the Station's spec list. * @return Indicates whether the StationSpec was deallocated. */ void DeallocateSpecFromStation(Station* st, byte specindex) { /* specindex of 0 (default) is never freeable */ if (specindex == 0) return; /* Check all tiles over the station to check if the specindex is still in use */ BEGIN_TILE_LOOP(tile, st->trainst_w, st->trainst_h, st->train_tile) { if (IsTileType(tile, MP_STATION) && GetStationIndex(tile) == st->index && IsRailwayStation(tile) && GetCustomStationSpecIndex(tile) == specindex) { return; } } END_TILE_LOOP(tile, st->trainst_w, st->trainst_h, st->train_tile) /* This specindex is no longer in use, so deallocate it */ st->speclist[specindex].spec = NULL; st->speclist[specindex].grfid = 0; st->speclist[specindex].localidx = 0; /* If this was the highest spec index, reallocate */ if (specindex == st->num_specs - 1) { for (; st->speclist[st->num_specs - 1].grfid == 0 && st->num_specs > 1; st->num_specs--); if (st->num_specs > 1) { st->speclist = ReallocT(st->speclist, st->num_specs); } else { free(st->speclist); st->num_specs = 0; st->speclist = NULL; } } } /** Draw representation of a station tile for GUI purposes. * @param x Position x of image. * @param y Position y of image. * @param axis Axis. * @param railtype Rail type. * @param sclass, station Type of station. * @param station station ID * @return True if the tile was drawn (allows for fallback to default graphic) */ bool DrawStationTile(int x, int y, RailType railtype, Axis axis, StationClassID sclass, uint station) { const StationSpec *statspec; const DrawTileSprites *sprites; const DrawTileSeqStruct *seq; const RailtypeInfo *rti = GetRailTypeInfo(railtype); SpriteID relocation; SpriteID image; SpriteID pal = PLAYER_SPRITE_COLOR(_local_player); uint tile = 2; statspec = GetCustomStationSpec(sclass, station); if (statspec == NULL) return false; relocation = GetCustomStationRelocation(statspec, NULL, INVALID_TILE); if (HasBit(statspec->callbackmask, CBM_STATION_SPRITE_LAYOUT)) { uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0x2110000, 0, statspec, NULL, INVALID_TILE); if (callback != CALLBACK_FAILED) tile = callback; } if (statspec->renderdata == NULL) { sprites = GetStationTileLayout(STATION_RAIL, tile + axis); } else { sprites = &statspec->renderdata[(tile < statspec->tiles) ? tile + axis : (uint)axis]; } image = sprites->ground_sprite; if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) { image += GetCustomStationGroundRelocation(statspec, NULL, INVALID_TILE); image += rti->custom_ground_offset; } else { image += rti->total_offset; } DrawSprite(image, PAL_NONE, x, y); foreach_draw_tile_seq(seq, sprites->seq) { Point pt; image = seq->image; if (HasBit(image, SPRITE_MODIFIER_USE_OFFSET)) { image += rti->total_offset; } else { image += relocation; } if ((byte)seq->delta_z != 0x80) { pt = RemapCoords(seq->delta_x, seq->delta_y, seq->delta_z); DrawSprite(image, pal, x + pt.x, y + pt.y); } } return true; } static const StationSpec* GetStationSpec(TileIndex t) { const Station* st; uint specindex; if (!IsCustomStationSpecIndex(t)) return NULL; st = GetStationByTile(t); specindex = GetCustomStationSpecIndex(t); return specindex < st->num_specs ? st->speclist[specindex].spec : NULL; } /* Check if a rail station tile is traversable. * XXX This could be cached (during build) in the map array to save on all the dereferencing */ bool IsStationTileBlocked(TileIndex tile) { const StationSpec* statspec = GetStationSpec(tile); return statspec != NULL && HasBit(statspec->blocked, GetStationGfx(tile)); } /* Check if a rail station tile is electrifiable. * XXX This could be cached (during build) in the map array to save on all the dereferencing */ bool IsStationTileElectrifiable(TileIndex tile) { const StationSpec* statspec = GetStationSpec(tile); return statspec == NULL || HasBit(statspec->pylons, GetStationGfx(tile)) || !HasBit(statspec->wires, GetStationGfx(tile)); }